Process of refining sugar.



H. WIESE.

PROCESS OF REFINING SUGAR.

APPLIOATION FILED JAN. 22, 1910.

991,580s I ratentedma awu.

fin enrar provements in' Processes of Refining Sugar,

1 fining raw cane sugar, and it is the primary bone black, which is an expensive factor in resulting 'productsthe. one the refined STA T 0 all whom it may concern: a I

Be it known that I, HERMANN VVinsE, a subject of the German Emperor, residing at Wallaceburg, in the, county of Kent and Province .of Ontario,,Dominion*of Canada,'x

have invented certain ,new and useful Imof which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to processes for reobject of the invention to avoid the use of the usual refining process.

It is a further object. to shorten the time of exposure of the syrup or sugar in solution, thereby preventing fermentation and the formation of invert sugar.

Still further it is an object .to obtain a process in which the refining may be carried on continuously, and with only two sugar. and the other the low grade mo lasses' all intermediary products being distributed and combined with grades of equal purity in the main process.

With these objects in view, the invention consists in the process as hereinafter setforth.

.ln thefdrawings is illustrated diagrammatically'an apparatus capable of carrying out the process. 1

The raw cane sugar is first melted at 1, the syrup being removed to a tank 2, and from there passed to a filter press 3. Here the mechanical and precipitated-organic impurities are removed from the syrup, and the latter passes into the tank i,wh1le the sweet water. or wash, for thefilter, isreturned to the melter l. From the tank-4 the liquid is pumped to an elevated tank 5, and is then passed into a vacuum pan 6, This is preferably so constructed that the boiling may be accomplished by the use of the exhaust steam, and with little expense. The boiled fillmasse is dropped into a.- mixer 7 and is cooled down to about.50 centigrade. It is then passed to a centrifugal 8 in which the syrup is "first removed from the crystals, and the latter are then.

Specification of Letters Patent.

collectedin a tank 10, and the thirdsyru from the water or steam washlng rang;-

, rnocnss or nnrmme suean.

Patented May, 9., 1911, Application filed January 22, 910. Serial No. 539,544. l

lect'ed in a tank 11. The result of this washing is that the sugar is free from glucose or invert sugar. r

The sugar obtained from the process thus far described is 'nefitpassed to a' seoond melter 12,'and/isa second time treated in" substantiallyp the same manner as already.

I .65 'tank '13, from this to a filter press 14. the

described, passing from: the melts-r to a purified syrup passing to a tank 15, and the second syrup being returned vto the melter 12. From the tank 15 the syrup passes to the blow-up '16, in which it is treated with lime or bicarbonate of soda to neutralize the juice, and this treatment can be carried on without, danger for the reason that' there is no glucose or invert sugar present. As a result of this treatment, the juice is'of an alkalinity such as to show a slight reaction by phenolphtalein. The,solution at --a temperature of 95 .centigrade is then fihered throughsand filter 17 passing'to the tank-18, from which it is elevated to a tank 19, and introduced into a second vacuum pan-20.: .The fillmasse from this pan; is

discharged to, the mixer 21, and thence to the centrifugal 22, where thesyrupas ex 'tracted, and the crystals are washed, a's

the previous treatment. The first syrup from the centrifugal 22, passes to the ltank 23, from which it is returned to the tank'fi, and combined with the juice from the :tank' 4. The second wash syrup from the cenfinal wash syrup passes to the tank 25. The sugarcryst'als remaining are-pure whiteand trifugal 22 passes to the tank 24, and the equal in grade 'to thos obtained by the bone black process. The sugar crystals are then passed to a bin 26, and then to a drier 27,

or it may be converted into any desired product; such as granulated 01' :loaf sugar. The syrup first extracted bytlie centrifirgal 8 is thinned down to 33 Baum, and is then. conveyed from the tank to tank 26,

from which it passes to a third vacuum pan 27 The resulting fillmasse passes tothe mixer 28 and centrifugal 29, from which the first syrup is collected in tank 30 and the second syrup in tank 31.: The sugar oh- .tained isequal in grade of purity to that i I resulting from the treatment in the centrifugal 8, and therefore is combined. with that product, and is passed to the melter 1 2. i

' The,second 'syrupacolleoted in. tank is passed-tea tank 33, whereit-isthin "d down to 33? }B.amn, is heated tam? eentig'rade, and isftalgen as ca-p iniaaemna; 2.7:

- turned to the nielter 1.

The syrup from the tank is elevated into tank 33, and in a subsequent treatment is boiled in vacuum pan 27, and the fillmassc is passed to the crystalliher 84, here it is kept under agitation and cooled for about two days. It is then assed to the mixer and to the centriiuga 36. The first syrup from this centrifugal is low grade molasses, which passes into the tank 3?. The second Wash'syrup is'lo green passing to the tank 38, from which it is elevated into a tank 39 and is taken on top of the crystallined fillmass in vacuum pan j tthe sugar from the centrifugal 36 beiiugr practically the same in grade as the raw lsugar, is re- The Wash syrups, with exception of those the treatment of which has already been described, are utilized at Various points in the process, above described. lhus,"theasecond syrup from the centriiugalS, which is collected in the tank 10, is elevated therefrom. to a tank 40, and is taken as a cap in vacuum pan 6. The third Wash syrup from centrifugal 8 collected in tank 11 is elevated to a tank 41, from which it isreturned to the ccntrii'aigal 8 for use as a second Wash syrup. The Wash syrup in tank 2% is passed to blow-up 42, 'Where it is neutralized as in 16, and is passed to the sand filter -13 and then to a tank 44, from which it is ele vateclto a tank 45. From the latter it is taken as a cap into the vacuum pan-20. The

I third wash syrup collected in the tank 25 is pumped to the tank 25 and used as a second Wash syrup in the centrifugal 22. Thus all of the intermediary product's are recombined with material for the main process, with the final products consisting ot a refined White sugar and low grade molasses. "What I claim as my invention is:

1. The process of refining raw cane sugar without the use of bone black, which consists in melting, filtering, boiling to :1 tillmasse, extracting the syrup and ashing the crystals whereby the latter are freed from invert sugar; in remelting, filtering, neutralizing, filtering, boiling to a fillmasse, extracting the syrup, and Washing the crystals.

2. The process of refinin raw-cane sugar without the use of bone b ack, which consists in melting, filtering,.boiling to fillmesa, extracting the syrup and Washing the crystals to free? the same from the inyert sugar; in 'remelting, filtering, neutralizing,

filtcringyboilmg to a fillmasse; extracting the syrup and Washing the crystals; in utilising the more refined grades oi the syrup eat-ranted at the various points in the process 69 hr Washes at a lower stage in the process and 1 for caps in the boiling process, in diluting the low grade syrup and repeating the process to extract further sugar therefrom, and in distributing the sugar obtained from the rades of equal purity in the main process.

to a fillmasse, separating the syrup and repeating the treatment to extract different grades of syrup; in distributing the sugars thus obtainedtothe grades of equal purity in the main process,"and in ut-ilizingthe i-' higher grades of the syrup for washes and for caps in thehoiling process whereby the final products are restricted to refined white sugar and low grade molasses.

Withoutthe use of bone black, which consists in melting, filtering, boiling to a fill masse, extracting the syrup, and ,washing the crystals; in remelting, filtering, neutralsyrup, and Washing the crystals; in diluting the low grade syrup and repeating the process to extract further su a1- therefrom, in distributing thesugar 0 the further extraction with the grades of equal purity in the main process, and in utilizing the more main process.

5. The process of Fefining raw cane sugar Without the use of bonebl'ack, which consists in melting, filtering, boiling to a fillmasse, extracting the syrup, and Washing the crystals; in remeltin the crystals, neutralizing, boiling to a fillniasse, extracting the syrup, and Washing the crystals; in 'dimolasses;

V In testimony Whereof i aflix my signature in presence of two Witnesses.

HER-MANN 'WFIESE.v

Witnesses NELLIE KI NsELL W, J. BELKNAP;

syrup treatment to combine the same with The process of refining raw cane sugar refined syrups as Washes and caps in the lilting the low grade syrup of the first ex'-' in distributing the stals to remove the invert sugar; in

tale; in diluting the low grade syrup, boiling 4. Theprocess 'of refininmraw cane sugar izing, boiling toa fillmasse, extracting the 

